There are no mobile WiMax networks, yet. What good will it do to have it on your phone? Maybe in a few years, but not now.
Maybe not in the US, but all of Mexico City is covered by a Wi-Max network (thats about 22M potential customers that pay way too much with Telcel and Telmex).
And if you have Skype-In and Wi-Max, you basically got a cellphone with the cheapest calling rates ever. Apple and many other US firms need to pull their heads out of their collective asses and realize there is tremendous growth potential in countries outside the US. Just because in the US you don't have Wi-Max or still have crappy CDMA, it doesn't mean you have to cripple your products (specially in the mobile phone market in which the US is behind Europe and some of Latin America)
I don't wanna deal with charging everyday.
Lazy bum